Bloomberg News: Apple’s top antenna expert warned that the iPhone 4 design could clobber signal strength and lead to dropped calls. The new design moved the phone’s antennas to the outside, integrated with a stainless steel band around the edge of the device. David Letterman offered his “Top 10 signs you’ve purchased a bad iPhone” Apple has fumbled in its response to the complaints, which began almost as soon as the phone went on sale. The company’s stock price has been falling, since before the phone was released in late June.”]